default.h

#ifndef CRYPTOPP_DEFAULT_H
#define CRYPTOPP_DEFAULT_H

#include "sha.h"
#include "hmac.h"
#include "des.h"
#include "filters.h"
#include "modes.h"

NAMESPACE_BEGIN(CryptoPP)

typedef DES_EDE2 Default_BlockCipher;
typedef SHA DefaultHashModule;
typedef HMAC<DefaultHashModule> DefaultMAC;

//! Password-Based Encryptor using DES-EDE2
class DefaultEncryptor : public ProxyFilter
{
public:
        DefaultEncryptor(const char *passphrase, BufferedTransformation *attachment = NULL);
        DefaultEncryptor(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment = NULL);

protected:
        void FirstPut(const byte *);
        void LastPut(const byte *inString, size_t length);

private:
        SecByteBlock m_passphrase;
        CBC_Mode<Default_BlockCipher>::Encryption m_cipher;
};

//! Password-Based Decryptor using DES-EDE2
class DefaultDecryptor : public ProxyFilter
{
public:
        DefaultDecryptor(const char *passphrase, BufferedTransformation *attachment = NULL, bool throwException=true);
        DefaultDecryptor(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment = NULL, bool throwException=true);

        class Err : public Exception
        {
        public:
                Err(const std::string &s) 
                        : Exception(DATA_INTEGRITY_CHECK_FAILED, s) {}
        };
        class KeyBadErr : public Err {public: KeyBadErr() : Err("DefaultDecryptor: cannot decrypt message with this passphrase") {}};

        enum State {WAITING_FOR_KEYCHECK, KEY_GOOD, KEY_BAD};
        State CurrentState() const {return m_state;}

protected:
        void FirstPut(const byte *inString);
        void LastPut(const byte *inString, size_t length);

        State m_state;

private:
        void CheckKey(const byte *salt, const byte *keyCheck);

        SecByteBlock m_passphrase;
        CBC_Mode<Default_BlockCipher>::Decryption m_cipher;
        member_ptr<FilterWithBufferedInput> m_decryptor;
        bool m_throwException;
};

//! Password-Based Encryptor using DES-EDE2 and HMAC/SHA-1
class DefaultEncryptorWithMAC : public ProxyFilter
{
public:
        DefaultEncryptorWithMAC(const char *passphrase, BufferedTransformation *attachment = NULL);
        DefaultEncryptorWithMAC(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment = NULL);

protected:
        void FirstPut(const byte *inString) {}
        void LastPut(const byte *inString, size_t length);

private:
        member_ptr<DefaultMAC> m_mac;
};

//! Password-Based Decryptor using DES-EDE2 and HMAC/SHA-1
class DefaultDecryptorWithMAC : public ProxyFilter
{
public:
        class MACBadErr : public DefaultDecryptor::Err {public: MACBadErr() : DefaultDecryptor::Err("DefaultDecryptorWithMAC: MAC check failed") {}};

        DefaultDecryptorWithMAC(const char *passphrase, BufferedTransformation *attachment = NULL, bool throwException=true);
        DefaultDecryptorWithMAC(const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment = NULL, bool throwException=true);

        DefaultDecryptor::State CurrentState() const;
        bool CheckLastMAC() const;

protected:
        void FirstPut(const byte *inString) {}
        void LastPut(const byte *inString, size_t length);

private:
        member_ptr<DefaultMAC> m_mac;
        HashVerifier *m_hashVerifier;
        bool m_throwException;
};

NAMESPACE_END

#endif

---